Question
Download Solution PDFA 3- point starter is used to:
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFIn a DC motor armature current is given by
Ia = (V - Eb) / Ra
Where, V = Terminal voltage,
Eb = Back emf, Ra = Armature resistance
The back emf (Eb) is developed as motor armature starts to rotate in presence of magnetic field. Initially back emf is zero, therefore starting armature current is high.
To limit or minimize starting armature current, we use 3- point starter. A three-point starter helps in starting and running the shunt wound motor or compound wound DC motor.
A three - point starter is used to reduce the starting current and it has three terminals
i) ‘L’ Line terminal (Connected to positive supply)
ii) ‘A’ Armature terminal (Connected to armature winding)
iii) ‘F’ Field terminal (Connected to field winding)
The no-volt coil is connected in series with the shunt field as shown in the figure of 3 point starter
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